node system and procedural in blender
There was many attempts, blendgraph from Atom for example, but if you want to make real node tool you should do much of work. Motion tools was also node-based.
procedural geometry in addons without nodes is tissue from Alessandro Zomparelli (he participate also in sverchok and his tissue addon partially is adaptive polygons node, there is also adaptive edges node from Linus Yng and much the same from zeffii).
Procedural is also citymaker, prokitectura and many-many other in all of kind.